Although my WoW guild uses Ventrilo, I was still pretty excited to see that Mac users could now make use of Teamspeak. Not through, uh, Teamspeak itself, but through a 3rd party Teamspeak compatible client called "Teamspeex".

Lots of further information and mirror sites available here: Macologist :: Home and here: booleanís n3wblog. You probably won't be able to access the actual author's website since he's either getting denial-of-service attacks or a tremendous amount of interest :-)

Teamspeak has posted their reaction here: Teamspeak::News. According to various sites, there was initially a threat of legal action, but it seems that calmer heads have prevailed, and the Teamspeak folks are actually going to have a look at it.